Lighting-arrester.



No. 857,045. PATENTED JUNE 18. 1907. G. L. POOTE. LIGHTNING ARRBSTER.

APPLIOATION FILED DBO.29,1906.

2 SHEETS-SHEET 1.

Q ;i llllllllm JM 5 i I PATENTED JUNE 18, 1907.

G. L. POOTEN LIGHTNING ARRBSTER, nrmourox 1:11.21) nnq 294906.

2 SHEETS-BHEET 2.

g wva Mm 5161 fimwml tain new and useful Im rovements in Lightnmg Arresters, of whic the following 1s a I in a small space as at a cable termina or 1n a conductor so that as a storm approaches the first or outside convolutions of the arrester made sectional to avoid entirely inclosing the choke coil functions of the helica con- -to t e line side that I provide UNITED STATES GEORGE L. FOOTE, OF NEW YoRK,

PATENT oEEIoE.

Y., ASSIGNOR TO FOOTE, PIERSON &

' COMPANY, or NEW YORK, N. Y., A FIRM;

LIGHTNING-ARRESTER.

Specification of Letters Patent.

Patented June 18, 1907.

. li ation filed December 29, 1906. Serial No. 849,987.

To all whom it may con/carry Be it "known that I, GEORGE LFFooTE, a cltlzen of the United States, and a resident of New York city, borough of Brooklyn, county of Kings, State of New York, have made cerspecification. I

Thisinvention relates to apparatus adapted to protect electrical instruments and machmery from discharges of atmospheric electricity and from currents of electricity of abnormally high electro-motive force.

The object of the invention is to supply a portable, compact, simple and effective device specially useful in caseswhere a large number of wires or conductors are rouped box elevated on a ole.

The im royed ightning arrester consists of a'cylin 'cal foundation of insulating material on which is a convoluted conductor, the convolutlons increasing in diameter from each end of the cylinder to a point midway the poles of the major axis. This is inclosed in acorrugated sheet metal casing designed for connection with the ground; by

sparking distance toward the outside line or will first discharge and as the storm comes nearer, its potential rising, successive convolutions will take part in the discharge, thus increasing the capacity; it is to insure the lacing of the shorter sparkin distance the double truncated cone form or core;-this arrange ment insures the location of the shortest sparking distance to line as the linemen cannot connect it into circuit improperly, and this arrangement also provides for way sta tions where storms are liable to approach fromeither direction; this sheet metal is the coil as it is found that when the'edges o the sheet metal casing are brought to ether ductors are impaired. Outside the sheet metal cylinder is a cylinder of insulating ma' terial which is referably fireproof material. The cylindric foundation is hollow and within the cylinder is a fuse or section of fusiarrester partly in section showing two ar-- resters on a single base; Flg. 2 1s a plan v1ew of the same partly in section; Fig. 3 is a section through the base block on the line 3, 3, Fig. 4; Fi 4 is a plan view of base blocks showing t eir registering contact surfaces and the electrical connections.

In Fig. 1, a is a cylindrical foundation of insulating material, preferably-porcelain, the upper end terminates in a ring 20; it has a hollow tapered interior 21; its outer surface has two sets of helical grooves 10, the diameter of each convolution increasing from the ends of the cylinder toward the center or point midway the poles where there is a ring or partition 61 formed with the foundation a;

w is a bare conductor wound in the helical groove 10. -There is a slot 11 through the partition d through which conductor to passes. The binding-post 22 forms a terminal for one end of the conductor w, the other end of conductor to is electrically connected to a screw socket terminals; terminal sis a spun sheet metal terminal having alternate grooves and depressions helically arranged; the terminal 8 fits a fixed terminal t of similar outline and material; terminal tis fixed in a base block of insulating material 17, by this means the arrester may be readily inserted and removed. The terminal 15 is connected by a metal strip 23 with a binding-post 24 fixed inthe base block I), (see Fig. 4);.25'isabinding-post on the base block connected to a metal strip 26 having a screw terminal 27 at the center of the open bottom socket terminal t. strip 27 has a screw-threaded hole.

f is a section of fusible metal inclosed in a suitable case, on the case is a screw terminal 28 which engages withth screw-threaded hole in the stri 27;. the upper end of the fuse f has a bin 'ng-post terminal 29 which The end of the ,to'whichthe ground wire is connected. At

der.

, the ring 1' laps onto the or near the center is a'hole h, shown in dotted lines in Fig. "2, through which a screw is passed to fix the block in position. The edges of the'block-areprovided with depres sions 40 and"projectio'ns 41 so arranged that the projection on one block will register with r the depressionon the adjacent block. This arrangement of registering pro'ections with a single screw hole for each bloc forms a simv ple and secure means of holding these blocks in position, as against a vertical wall, for in' stance. There is a corrugated sectional cylinder .or casing of sheet metal 0 arranged outsidecoiled, conductor '11) this cylinder'is incomplete, a section is omitted between lines parallel with'the axis andseparated 10 or 12 degrees. This is done to avoid interference with the choke coil action of the coiled conductor w which would result if the cylinder were completewith its edges electrically united. I call this a sectional cylin- It is of uniform diameter and is centered by the partition (2 at the center of the foundation a. It also rests upon the seat 42 at one end of the foundation (1 and upon the seat 43 at the other end. The cylinder 0 is corrugated with acute an ular corrugations,- 'the' object being to surrofiiud the conductor w with acute angular poin s or lines as it is found that this facilitates the discharge of high potential electricity. -The cylinder 0 has a flaring metal ring 7 at the bottom and ound contact strip 9; the ring 1' is prefera ly soldered. to the cylinder 0. Outsidethe corrugated cylinder cis placed a jacket 9' of insulating material and referably of fireproof insulating mate rial ike asbestos, the object. or" this is to' guard against fire risk. fThe location of the fusible section f on the interior of the fireproof foundation a is also an efiicient protection against the same risk.

By arranging the ground contact in a straight line, that is, the wall of the corrugated cylinder 0 and by graduating the distance of the helical conductor to with respect to this line the discharge "of electricity of varying potential is provided for and. by the the fusible section f is always on the outside ouble taper arrangement of the conductor 1. In a li htning arrester the combination of a tapere core of insulating material having a helical groove in its surface, a bare conductor supported n said groove and an insulated conducting medium fixed parallel with the axis of said core and in close proximity to said conductor.

.2. In a lightning arrester the combination of a core of insulating material tapered from the center toward each end arid having a helical groove in its surface, a bare conductor supported in said groove and an insulated conducting medium fixed parallel with the axis of said core and in close proximity to said conductor.

3. In a 1i htning arrester the combination of a tapere core of insulating material having a helical groove in its surface, a bare conductor supported in said groove and an insulated sheet of conductin material arran ed to form an incomplete cy inder, fixed parallel with the axis of said core outside of and in close proximity to -said conductor.

4. In a lightning arrester the combination of a core of insulating material having a tapered axial passage from end to end, a helical conductor supported upon the surface of said core, an exterior conductor in close proximity insulated therefrom and an inclosed section of fusible conductor located in the tapered interior of the core and connected in series with the helical conductor.

5. In a lightning arrester the combination of a core of insulating "material having an axial assage extending from end to end, a helical of said core, an exterior conductor in close proximity to but insulated from said helical conductor, a section of fusible conductor inclosed in a protecting tube of insulating ma terial located in said axial passa e in the core, a screw terminal for said fusib c section engaging a screw socket in the'bottom of said passa e, a screw terminal for the upper end of said fusible section and a link of conductin material for uniting the terminals of the helical coil to the fusible section.

6. In a li htning arrester the combination of a suitab score of insulating material, a helical conductor suitably supported thereon and an external ground contact fixed in close proximity parallel with the major axis consisting of a curved sheet of metal havin crimps or corrugations in its surface paralle with the axis of the core.

7. In a li htning arrester the combination of a suitabIe core of insulating material, a helical conductor. supported thereon, an external ground contact fixed in close proximity parallel'with the major axis,'cons1sting of a curved sheet of metal having crimps or corrugations in its surface arran ed parallel with the axis of the core and a cy der of insulating material inclosing said curved sheet of meta conductor supported upon the surface.

8. The combination of a series of insulat- I l one edge and a depression on the other edge of each base block arranged to engage or register with similar projections and depressions on adjacent base blocks.

GEORGE L. FOOTE.

WVitne sses HENRY G. FIuTsonE, A. M. DONLEVY. 

